Ultraviolet-curable resin composition and optical fiber

Patent metadata

Field	Value
Publication number	US-10358577-B2
Application number	US-201816170449-A
Country	US
Kind code	B2
Filing date	Oct 25, 2018
Priority date	Oct 26, 2017
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

In an ultraviolet-curable resin composition for an optical fiber coating, the polarity parameter E T (30) of the resin composition is 47 to 61.

First claim

What is claimed is:

1. An ultraviolet-curable resin composition for an optical fiber coating, wherein a polarity parameter E T (30) of the resin composition is 47 to 61, wherein the polarity parameter E T (30) is determined by dissolving a betaine dye having a structure represented by a following formula (1) in the resin composition, measuring a maximal absorption wavelength λmax, and calculating according to the following expression:
E T (30)=28591/λmax [nm]

2. The ultraviolet-curable resin composition according to claim 1 , wherein the polarity parameter E T (30) is 51 to 61.

3. The ultraviolet-curable resin composition according to claim 1 , comprising a urethane (meth)acrylate oligomer, a monomer, and a photopolymerization initiator.

4. The ultraviolet-curable resin composition according to claim 3 , wherein the monomer comprises a nitrogen-containing monomer, and a content of the nitrogen-containing monomer is 15% by mass or less based on a total amount of the resin composition.

5. The ultraviolet-curable resin composition according to claim 4 , wherein the nitrogen-containing monomer comprises a heterocycle-containing (meth)acrylate or an N-substituted amide monomer.

6. An optical fiber comprising:
an optical transmission medium comprising a core and a cladding;
a primary resin layer being in contact with the optical transmission medium and covering the optical transmission medium; and
a secondary resin layer covering the primary resin layer,
wherein the secondary resin layer is a cured product of the ultraviolet-curable resin composition according to claim 1 .

7. The optical fiber according to claim 6 , wherein the polarity parameter E T (30) is 51 to 61.

8. The optical fiber according to claim 6 , wherein the ultraviolet-curable resin composition comprises a urethane (meth)acrylate oligomer, a monomer, and a photopolymerization initiator.

9. The optical fiber according to claim 8 , wherein the monomer comprises a nitrogen-containing monomer, and a content of the nitrogen-containing monomer is 15% by mass or less based on a total amount of the resin composition.

10. The optical fiber according to claim 9 , wherein the nitrogen-containing monomer comprises a heterocycle-containing (meth)acrylate or an N-substituted amide monomer.

Assignees

• Sumitomo Electric Industries

Inventors

• Homma Yuya
• Sohma Kazuyuki
• Shimada Kensaku

Classifications

• C09B69/001

  Dyes containing an onium group attached to the dye skeleton via a bridge · CPC title

• C09B57/00

  Other synthetic dyes of known constitution · CPC title

• C09D175/14 Primary

  Polyurethanes having carbon-to-carbon unsaturated bonds · CPC title

• C08G18/4845

  containing oxypropylene or higher oxyalkylene end groups · CPC title

• C08G18/755

  and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate · CPC title